114 lines
2.9 KiB
Go
114 lines
2.9 KiB
Go
package crypto
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import (
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"crypto/tls"
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"errors"
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"strings"
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)
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// A CertChain holds a certificate and a private key
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type CertChain interface {
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SignServerProof(sni string, chlo []byte, serverConfigData []byte) ([]byte, error)
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GetCertsCompressed(sni string, commonSetHashes, cachedHashes []byte) ([]byte, error)
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GetLeafCert(sni string) ([]byte, error)
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}
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// proofSource stores a key and a certificate for the server proof
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type certChain struct {
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config *tls.Config
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}
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var _ CertChain = &certChain{}
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var errNoMatchingCertificate = errors.New("no matching certificate found")
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// NewCertChain loads the key and cert from files
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func NewCertChain(tlsConfig *tls.Config) CertChain {
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return &certChain{config: tlsConfig}
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}
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// SignServerProof signs CHLO and server config for use in the server proof
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func (c *certChain) SignServerProof(sni string, chlo []byte, serverConfigData []byte) ([]byte, error) {
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cert, err := c.getCertForSNI(sni)
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if err != nil {
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return nil, err
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}
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return signServerProof(cert, chlo, serverConfigData)
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}
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// GetCertsCompressed gets the certificate in the format described by the QUIC crypto doc
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func (c *certChain) GetCertsCompressed(sni string, pCommonSetHashes, pCachedHashes []byte) ([]byte, error) {
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cert, err := c.getCertForSNI(sni)
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if err != nil {
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return nil, err
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}
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return getCompressedCert(cert.Certificate, pCommonSetHashes, pCachedHashes)
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}
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// GetLeafCert gets the leaf certificate
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func (c *certChain) GetLeafCert(sni string) ([]byte, error) {
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cert, err := c.getCertForSNI(sni)
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if err != nil {
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return nil, err
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}
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return cert.Certificate[0], nil
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}
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func (cc *certChain) getCertForSNI(sni string) (*tls.Certificate, error) {
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c := cc.config
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c, err := maybeGetConfigForClient(c, sni)
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if err != nil {
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return nil, err
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}
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// The rest of this function is mostly copied from crypto/tls.getCertificate
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if c.GetCertificate != nil {
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cert, err := c.GetCertificate(&tls.ClientHelloInfo{ServerName: sni})
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if cert != nil || err != nil {
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return cert, err
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}
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}
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if len(c.Certificates) == 0 {
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return nil, errNoMatchingCertificate
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}
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if len(c.Certificates) == 1 || c.NameToCertificate == nil {
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// There's only one choice, so no point doing any work.
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return &c.Certificates[0], nil
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}
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name := strings.ToLower(sni)
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for len(name) > 0 && name[len(name)-1] == '.' {
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name = name[:len(name)-1]
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}
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if cert, ok := c.NameToCertificate[name]; ok {
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return cert, nil
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}
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// try replacing labels in the name with wildcards until we get a
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// match.
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labels := strings.Split(name, ".")
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for i := range labels {
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labels[i] = "*"
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candidate := strings.Join(labels, ".")
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if cert, ok := c.NameToCertificate[candidate]; ok {
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return cert, nil
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}
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}
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// If nothing matches, return the first certificate.
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return &c.Certificates[0], nil
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}
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func maybeGetConfigForClient(c *tls.Config, sni string) (*tls.Config, error) {
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if c.GetConfigForClient == nil {
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return c, nil
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}
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return c.GetConfigForClient(&tls.ClientHelloInfo{
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ServerName: sni,
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})
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}
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